Investigation of inhibitive effects of phosphonic acids on corrosion of iron in 3% sodium chloride solution
Bibliographic record
Abstract
Thiomorpholin-4-ylmethyl-phosphonic acid (TMPA) and morpholin-4-methyl-phosphonic acid (MPA) have been synthesised using a microwave technique. The crude product obtained was purified and characterised by nuclear magnetic resonance spectroscopy (1H NMR,13C NMR, 31P NMR) and infrared spectroscopy. The inhibition efficiencies of the synthesised compounds have been studied by Tafel polarisation curve determinations and weight loss techniques. The comparison of the results with those reported previously for piperidin-1-yl-phosphonic acid showed that TMPA and MPA were better inhibitors. The addition of these compounds to aggressive media was accompanied by a decrease of the corrosion current density and a corresponding reduction of the corrosion rate. The inhibition efficiency increased with increasing inhibitor concentration. It reached 99·6 and 96·3% at a concentration of 5 × 10−3 M for TMPA and MPA respectively. The adsorption of the inhibitors was found to follow the Langmuir's isotherm. However, the determination of the film chemical nature required the use of Fourier transform infrared spectroscopy.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".